An integrity monitoring method for an aircraft is disclosed. The integrity monitoring method includes determining a set of non-uniform weights. The non-uniform weights are based on a least squares approximation of a linearized measurement equation. The integrity monitoring method also includes applying the non-uniform weights in a receiver autonomous integrity monitoring (RAIM) system. Further, the integrity monitoring method includes determining a reduced integrity limit based on the output of the RAIM system.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An integrity monitoring system for an aircraft, comprising: a weight generation subsystem, generating a set of non-uniform weights based on a least squares approximation of a linearized measurement equation; a receiver autonomous integrity monitoring (RAIM) subsystem applying the set of non-uniform weights; and a horizontal integrity limit (HIL) subsystem generating a reduced horizontal integrity limit based on the output of the RAIM subsystem.
2. The system of claim 1 , wherein the non-uniform weights are generated in the form of a square matrix.
3. The system of claim 2 , wherein the square matrix is a diagonal matrix.
4. The system of claim 3 , wherein the elements of the diagonal matrix are non-negative.
5. The system of claim 1 , further comprising: a HIL evaluation subsystem.
6. The system of claim 5 , wherein the HIL evaluation subsystem uses a lookup table.
7. An integrity monitoring system, comprising: matrix including a set of non-uniform weights, based on a least squares approximation of a linearized measurement equation; a receiver autonomous integrity monitoring (RAIM) system for applying the set of the non-uniform weights; and an integrity limit subsystem for determining a reduced integrity limit based on the output of the RAIM system.
8. The system of claim 7 , wherein the non-uniform weights are provided in the form of a square matrix.
9. The system of claim 8 , wherein the square matrix is a diagonal matrix.
10. The method of claim 9 , wherein the elements of the diagonal matrix are non-negative.
11. The method of claim 7 , further comprising: a means for applying a look-up table method for evaluation of the integrity limit.
12. An autonomous integrity monitoring system for use in a receiver, comprising: a weight generation subsystem for determining a set of non-uniform weights, based on a least squares approximation of a linearized measurement equation; a weight application subsystem for applying the non-uniform weights; and an integrity limit subsystem for providing a reduced integrity limit based on an output of the weight application subsystem.
13. The system of claim 12 , wherein the non-uniform weights are provided in the form of a square matrix.
14. The system of claim 13 , wherein the square matrix is a diagonal matrix.
15. The system of claim 14 , wherein the elements of the diagonal matrix are non-negative.
16. The system of claim 12 , further comprising: a look-up subsystem for applying a look-up table method for evaluation of the integrity limit.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 29, 2005
August 24, 2010
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